基于SEA模型的整车声学包优化研究

Optimization of Vehicle Sound Package Based on SEA Model

基于统计能量理论,以某SUV车型为研究对象,建立了整车SEA模型,通过面连接的方式加载前围和地板的隔声测试数据,并基于SPL测试和PBNR测试对整车模型进行对标调校,保证了模型优化分析的精确性。针对与目标车传递路径隔声量的差距,通过传递路径贡献量分析,明确了整车声学包的薄弱路径以及贡献量最大的关键子系统,从密度、覆盖率等方面对声学包材料进行优化,使整车的传递路径隔声量提升2~6 dB,并达到了目标车水准。结果表明,采用SEA方法对整车声学包进行优化仿真能明显改善整车噪声水平,为后续声学包设计提供指导和方向。

A statistical energy analysis(SEA)model is established for a certain SUV model.The test data of sound transmission loss of the firewall and the floor are loaded by the surface connection method,and the vehicle model is calibrated based on the SPL test and the PBNR test to ensure the accuracy of the model optimization analysis.According to the difference in sound transmission loss between the model results and the data for the target vehicle,the weak path in the vehicle sound package and the key subsystem with the largest contribution are determined through the analysis of transmission path contribution.The sound package is optimized in terms of density,coverage,thickness,material composition,etc.,so that the sound transmission capacity of the vehicle’s transmission path is increased by 2~6 dB and reaches the target level.Using the SEA method to optimize the vehicle sound package can significantly improve the vehicle noise performance and can provide guidance and directions for the subsequent design of sound package.